Whoa and Whew!
I was just going to post a very similar question/vent. LO is 4 month old and drooling non-stop. Everything goes in the mouth -- she even tries to get her foot in there while we nurse. She's incredibly distracted while we nurse and, sigh, she no longer sleeps for a good 5.5 hour stretch. Plus, she's spitting up multiple times a day and often right after feeds.
I knew about the 4 month fussies from WAB. I didn't know if the spitting up was related and was getting a tad nervous that I was feeding too much (though, I know, "can't overfeed a BF baby & spit up = laundry problem, no more, no worse). We nurse much more than every 2 hours, but that's because I don't wait for cues before offering -- I need those little 2-3 mins nursing breaks or else I'll never sit again! Wasn't sure if that was why she was spitting up.
Once you get into the zone.... BAM! The fussies!